At the 2009 AMS Annual Meeting, William Drabkin (University of Southampton) presented his own composition of a first movement for Haydn's incomplete String Quartet, Op. 103. In this paper, Drabkin explains how he completed the quartet by writing a finale based on the fugue subject from a contemporary solo violin piece, and on the opening bars of Haydn's own partsong Der Greis.
Downey, Charles T.
"Video Review: Nicholas Harnoncourt and the Theater an der Wien, Il Mondo della Luna.,"
HAYDN: The Online Journal of the Haydn Society of North America: Vol. 2
, Article 1.
Available at: https://remix.berklee.edu/haydn-journal/vol2/iss2/1